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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
3126
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$32.2B
| $716K | ﹤0.01% |
+7,007
| New | +$743K |
2026 Q3
0 quarters
|
|
3127
PUT
Recursion Pharmaceuticals
RXRX
$2.08B
| $716K | ﹤0.01% |
173,300
+13,300
| +8% | +$45.1K |
2026 Q1
2 quarters
|
|
3128
CALL
Vistance Networks Inc
VISN
$814M
| $715K | ﹤0.01% |
119,500
+49,600
| +71% | +$488K |
2016 Q2
41 quarters
|
|
3129
PUT
Dave & Buster's
PLAY
$273M
| $715K | ﹤0.01% |
112,000
+37,500
| +50% | +$350K |
2017 Q3
36 quarters
|
|
3130
PUT
Rithm Capital
RITM
$5.03B
| $714K | ﹤0.01% |
80,000
+10,200
| +15% | +$98.7K |
2016 Q2
41 quarters
|
|
3131
PUT
Imperial Oil
IMO
$60.1B
| $714K | ﹤0.01% |
5,800
-2,200
| -28% | -$280K |
2025 Q1
6 quarters
|
|
3132
PUT
Hesai Group
HSAI
$2.23B
| $713K | ﹤0.01% |
44,700
+13,400
| +43% | +$228K |
2024 Q1
10 quarters
|
|
|
AIRL
3133
CALL
DELISTED
Themes Airlines ETF
AIRL
| $712K | ﹤0.01% |
65,600
+31,200
| +91% | +$339K |
2025 Q2
5 quarters
|
|
3134
CALL
Heartflow Inc
HTFL
$5.21B
| $711K | ﹤0.01% |
14,300
-1,500
| -9% | -$56.9K |
2026 Q2
1 quarter
|
|
3135
PUT
Fidelity National Financial
FNF
$11.6B
| $711K | ﹤0.01% |
18,400
+12,400
| +207% | +$590K |
2019 Q2
29 quarters
|
|
3136
PUT
L3Harris
LHX
$50.6B
| $710K | ﹤0.01% |
3,000
-1,400
| -32% | -$381K |
2020 Q1
26 quarters
|
|
3137
TPG
TPG
$8.67B
| $710K | ﹤0.01% |
16,088
-112,432
| -87% | -$5.3M |
2026 Q1
2 quarters
|
|
3138
McEwen Inc
MUX
$736M
| $709K | ﹤0.01% |
39,701
-31,721
| -44% | -$595K |
2025 Q4
3 quarters
|
|
3139
CALL
Labcorp
LH
$30.2B
| $709K | ﹤0.01% |
2,300
+1,600
| +229% | +$496K |
2026 Q2
1 quarter
|
|
3140
CALL
Eastman Chemical
EMN
$7.5B
| $707K | ﹤0.01% |
10,900
-600
| -5% | -$41.8K |
2014 Q4
47 quarters
|
|
3141
CALL
Crown Holdings
CCK
$13B
| $706K | ﹤0.01% |
6,700
-10,000
| -60% | -$1.15M |
2018 Q2
33 quarters
|
|
3142
CALL
Corebridge Financial
CRBG
$15.8B
| $705K | ﹤0.01% |
21,300
-74,800
| -78% | -$2.45M |
2022 Q4
15 quarters
|
|
3143
Mistras Group
MG
$643M
| $705K | ﹤0.01% |
33,492
+20,341
| +155% | +$365K |
2025 Q2
5 quarters
|
|
3144
Polaris
PII
$3.68B
| $705K | ﹤0.01% |
13,519
-14,572
| -52% | -$941K |
2025 Q2
5 quarters
|
|
3145
Roundhill Photonics & Optics ETF
LYTE
| $704K | ﹤0.01% |
+28,913
| New | +$726K |
2026 Q3
0 quarters
|
|
3146
PUT
Oxford Industries
OXM
$424M
| $704K | ﹤0.01% |
28,800
+24,100
| +513% | +$844K |
2025 Q1
6 quarters
|
|
3147
Hims & Hers Health
HIMS
$4.62B
| $703K | ﹤0.01% |
23,591
-23,265
| -50% | -$714K |
2026 Q2
1 quarter
|
|
3148
CALL
Five Below
FIVE
$13.6B
| $703K | ﹤0.01% |
3,200
-300
| -9% | -$67.3K |
2014 Q4
47 quarters
|
|
3149
CALL
Bank of Montreal
BMO
$120B
| $702K | ﹤0.01% |
4,200
-19,600
| -82% | -$3.46M |
2015 Q3
44 quarters
|
|
3150
CALL
Terrestrial Energy
IMSR
$265M
| $701K | ﹤0.01% |
180,300
-111,500
| -38% | -$580K |
2025 Q3
4 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.